feat: initialize sunrise with 100-player shared rooms

2026-10-30 16:36:35 +09:00
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+# Prebuilt buildings implementation plan
+
+**Goal:** Load precomputed building geometry and illumination without changing appearance.
+**Architecture:** Keep the existing generator for offline preparation and experiments. Share material/shader/update logic with a small binary loader. Store exact typed arrays, indices, light pixels, bounds, counts and target; reject stale artifacts at build time using source hashes. No new dependencies or geometry compression.
+
+- [x] Add equivalence and loader tests, confirm failure before implementation.
+- [x] Extract shared scene and light-texture restoration; add binary loading and offline generation.
+- [x] Switch main/world to baked assets; preserve experiment generator API.
+- [x] Generate assets, check exact equivalence and stale-file rejection, run tests/build and preview.
+- [x] Document regeneration and measured sizes, review resource handling.
+
+Verification: original and restored position/normal/light-height/index arrays, bounding volumes, counts, target, material colors, spill pixels/bounds and night/dawn/day intensity match exactly. Browser midnight/noon views render with no console errors. 44 tests pass; production build passes with the existing bundle-size warning. Independent review found source hash sensitivity to checkout line endings; normalized CRLF to LF for text inputs and verified both remain fresh while changed content is rejected.
+
+Output: 10,028,176-byte binary (8,979,600 geometry + 1,048,576 light pixels) plus JSON metadata. Local Node assembly-only timings across 3 runs: generation 571.72–786.20ms, restoration 0.14–0.40ms; excludes download, parsing, GPU upload, other scene work. No total-load-time or FPS claim.